The YSI 58 is a proven field and laboratory instrument. The 58 displays oxygen concentrations in two temperature-compensated modes.
The instrument offers manual salinity correction, recorder output, and operation from line power or batteries. The case also holds additional
batteries for an optional DO field stirrer.
- Portable
- Lab and field
- Rugged
- Works with a variety of YSI probes
YSI 58 Instrument General Specifications
Medium | fresh, sea, or polluted water and most other liquid solutions | |
Mode to Mode Accuracy (mg/L to % air saturation) |
+ 0.5% of reading, + 2 least significant digits (in the 0.01 mg/L mode) |
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Power | 4 D-size Alkaline Batteries (included) Approximately 1000 hours operation from each new set of batteries. Low battery indicator signal (LOBAT) appears automatically when approximately 50 hours of battery life remain. |
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Recorder Output | Voltage | 0 to 1 volt, full scale |
Accuracy | + 0.4 % of full scale, + 1 least significant digit (in the 0.01 mg/L mode) |
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Minimum Load Impedance | 50 K OHM | |
Salinity Compensation | Range | 0.0 to 40.0 ppt |
Accuracy | + 0.3% of reading + 1 digit | |
Temperature | Operating |
0 to +45 °C |
Storage | 0 to +45 °C |
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Temperature Compensation |
The mg/L modes are automatically temperature compensated to an accuracy of + 1% of the dissolved oxygen reading between 5 and 45°C; and to an accuracy of +2% between 0 and 5. °C. See Temperature Sensitivity in probe specifications. |
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Water Resistance |
With RECORDER OUT, BATT ELIM and STIRRER receptacles capped, every case opening is splash resistant. | |
Warranty |
2-year instrument |
YSI 58 Specifications (Instrument Only)
Range | Accuracy | Resolution | |
Dissolved Oxygen (%) |
0 to 200% air saturation | +0.3% Air Saturation | 0.1% air saturation |
Dissolved Oxygen (mg/L) |
0 to 20 mg/L | 0.03 mg/L |
.01 mg/L |
Temperature |
-5 to 45°C | ± 0.3 °C, plus probe interchangeability |
0.1°C |
Probe Specifications for:
YSI 5239
YSI 5718
YSI 5739
YSI 5750
YSI 5905
Dissolved Oxygen Accuracy | ± 0.1 mg/L or ± 2% of reading, whichever is greater | |
Electrolyte | 5739, 5718, 5750 |
KCl with Kodak Photo-Flo |
5905, 5239 | KCl with NA2SO4 | |
Membrane Material | 5905 | FEP PTFE Cap |
5239, 5718, 5739, 5750 | .001” FEP PTFE Film .0005” FEP PTFE available, YSI 5776 |
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Pressure Compensation | Effective 0.5% of reading with pressures to 100 psi (230 feet of seawater) |
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Polarizing Voltage | 0.8 volts nominal | |
Probe Current | Air at 30°C | 19 microamps nominal |
Nitrogen at 30°C | 15 microamps or less |
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Probe Response Time | 5905 | Typical response to a step change in dissolved oxygen at 20°C is 90% of the change in 30 seconds. |
5239, 5718, 5739, 5750 |
Typical response for temperature and dissolved oxygen readings is 90% in 10 seconds at a low constant temperature of 30°C with the 5775 membrane. DO response and low temperature and low DO is typically 90% in 30 seconds. YSI 5776 High Sensitivity membranes may be used to improve response at low temperature and DO concentrations. |
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Sensor Materials | Cathode | Gold |
Anode | Silver | |
Temperature | Accuracy | + 0.2°C |
Operating Range | 0° to 45°C | |
Sensitivity | When measuring oxygen, the probe output current increases approximately 3.5% per 1°C of increase in temperature. The circuitry automatically compensates for this effect in a typical probe. However, the exact temperature sensitivity of an individual probe may vary slightly according to its condition. Therefore, a probe should be calibrated at a temperature close to the measurement temperature in order to minimize the possible effect of such variation. |
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Warranty |
1-year |
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